This upgrade adds support for the transgender flag: 🏳️‍⚧️
There's some additional housekeeping in this commit:
- Twemoji recently rearranged their repository and package, so `Gruntfile.js` needed tweaking to allow for that.
- As only new files were added in this Twemoji release, the CDN version didn't need updating.
Fixes #47852.
git-svn-id: https://develop.svn.wordpress.org/trunk@45769 602fd350-edb4-49c9-b593-d223f7449a82